Research Article
Heavy Cigarette Smokers in a Chinese Population Display a Compromised Permeability Barrier
Table 1
Clinical characteristics of subjects.
| Group | | Age | Years of smoking | Number of cigarettes/day |
| Nonsmokers | 36 | 53.00 ± 1.20 | N/A | N/A | All smokers | 63 | 54.21 ± 0.81 | 28.79 ± 1.16 | 18.03 ± 1.15 | ≥20 cigarettes/day | 36 | 54.72 ± 1.04 | 30.28 ± 1.18 | 23.61 ± 1.27 | <20 cigarettes/day | 27 | 53.52 ± 1.26 | 26.81 ± 2.17 | 10.59 ± 0.88 |
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